Permission checking for the system application is backwards.

(closes issue #17550)
 Reported by: kenner
 Patches: 
       manager.c.diff uploaded by kenner (license 1040)
 Tested by: kenner


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@273144 65c4cc65-6c06-0410-ace0-fbb531ad65f3